无法获取构造函数方法以使用Java打印到控制台

Question

I am having an issue in terms of trying to get the constructor method to print to the console when the object has been instantiated from within the main method:

public class HelloWorld {

    public static void main(String[] args) {
        Message message = new Message();
        System.out.println(message.helloWorld());
    }  
}

Here is the object that has been instantiated:

public class Message {

    public void Message() {
        // constructor method
        System.out.println("Constructor Method!");
    }

    public String helloWorld() {
        return "Hello, World!";
    }
}

I assumed the constructor method would print to the console?

Answer 1

This does not declare a constructor:

public void Message() {

Constructors have no return type; this is a method. Remove void :

public Message() {

Answer 2

problem:

 public void Message() {

It is not a constructor, it is a method thus it is not called upon creating the instance of your class

it should be this:

 public Message()

Answer 3

Why are you thinking that constructor method should print? It will not print. Because you have not declare a constructor. You just only have 2 methods.

This is not a constructor. this is just another method. Constructors doesn't have a return type.

public void Message() {
        // constructor method
    System.out.println("Constructor Method!");
} 

But if you have like this

public Message() {
        // constructor method
    System.out.println("Constructor Method!");
}

Then it is a constructor and it will get print

Answer 4

Wrong constructor declaration , public void Message() { } should be public Message() { } :

public class Message {

public Message() { // <-- Here's the correct constructor declaration
    System.out.println("Constructor Method!");
}

public String helloWorld() {
    return "Hello, World!";
}
}

Answer 5

this is not a Constructor but a normal method, you have to remove the void to be a constructor:

public Message() {...}

NOT

public void Message(){...}